[layer8]

One important aspect TFA is not explaining is that you could move the cursor around the screen and edit and re-execute any command or program line. So it wasn’t just a linear REPL. And it didn’t have history nor typically copy & paste.

[flohofwoe]

The screen editor was a feature of specific BASIC interpreters though, for instance the BASIC on Acorn Atoms didn't allow it (AFAIK only later on the BBC Micro). Some BASIC screen editors also had a primitive form of copy/paste.